Davy Jones [link to en.wikipedia.org] is a fictional character in the Pirates of the Caribbean series. He appears as the central antagonist of Dead Man's Chest and At World's End. Davy Jones is the captain of the Flying Dutchman (based on the feared ghost ship of the same name featured in nautical lore), roaming the seas in search of souls to serve upon his vessel for a century. In the story, his original purpose was to carry souls of those who died at sea from this world to the next on his vessel. He was charged with this duty by his one true love, a sea goddess named Calypso. ... Unable to deal with Calypso's betrayal, he ripped out his heart and placed it in a chest, burying it on land. This chest became known as the Dead Man's Chest, the primary object being sought after in the second film. Jones then abandoned his duties, and instead ruled the seas as a tyrant with a damned crew bound by oath to serve aboard the Dutchman for one hundred years each. Bound to the duties of the Flying Dutchman both he and his crew slowly transformed into sea monsters.The character is based on the legendary devil of the seas with the same name, according to superstition among sailors in the 18th and 19th centuries.

Quoting: wiki

The name Davy Jones - and particularly Davy Jones' Locker - has become synonymous with disaster at sea."... the fiend that presides over all the evil spirits of the deep..."Since Davy Jones is the malevolent spirit of the deep, it makes sense that the bottom of the ocean - the final resting place of many sailors, traders and pirates alike - would be seen as his domain.